Cone 소산시험과 Rowe Cell 압밀시험을 이용한 수평압밀계수 상관관계 분석

고영헌(Young-Hun Ko),권기복(Gi-Bok Kwon),류권일(Kwon-ll Ryu),김팔규(Pal-Kyu Kim) 대한토목학회 2002 대한토목학회 학술대회 Vol.2002 No.11

토압과 윤압에 따른 지중매설연성관의 변형특성 연구

Young-Hun Ko(고영헌),Jong-Yob Park(박종엽),Gwon-il Ryu(류권일),Pal-Kyu Kim(김팔규) 대한토목학회 2002 대한토목학회 학술대회 Vol.2002 No.11

대절토 암반사면의 안정화 검토 및 현장계측 분석

박범준,류권일,고영헌,김팔규 忠南大學校 産業技術硏究所 2003 산업기술연구논문집 Vol.18 No.2

We investigated the stability of rock slope caused by large-scale cutting on construction of rapid-transit railway. Applying anchor method in order to build the up, we analyzed the stability using long-term measurement. Slope stability analysis is established by STABL 5M and DIPS as basic programs. Field measurement is required to prove the stability of rock slope which results from the reinforcement corresponding to slope stability analysis. Thus, we used one ground inclinometer and 8 load-cells for the measurement system.

Piezocone과 Rowe Cell을 利用한 水平壓密係數 推定

권기복,류권일,고영헌,김팔규 忠南大學校 産業技術硏究所 2002 산업기술연구논문집 Vol.17 No.1

Site characterization is one of the most important performances in projects with regard to solving geotechnical problems. Piezocone penetration test is a fast, economic, and accurate method of site characterization. Static cone penetrometer and the piezocone represents the most versatile tools currently available for soil exploration. The cone penetration and piezocone tests provide continuous sounding capability and repeatability. Rare of consolidation parameter may be assessed form the Piezocone test by measuring the dissipation or decay of pore pressure with time after a stop in penetration. And many researches have been developed to determine the horizontal coefficent of consolidation from the Piezocone test. Many of these researches using a theoretical solutions which is determined from either the cavity expantion theory or the stress path method. However, depending on assumptions and analytical techniques, the results can be varied considerably. For that reason, many researchers make their effort to improve and complement the defect of already established methods. In this dissertation, the correlation between the Coefficient of Consolidation from Piezocone dissipation test and the Coefficient of Consolidation Rowe Cell horizontal consolidation test in many cases was studied. The purpose of this study is to know the changing of the Coefficient of Consolidation by loading condition while Rowe Cell horizontal consolidation test is used

편심하중 작용시 극한해석 상계법을 이용한 얕은 기초의 지지력 분석

상현규,류권일,고영헌,김팔규 忠南大學校 産業技術硏究所 2001 산업기술연구논문집 Vol.16 No.2

In the study the bearing capacity of the eccentrically loaded shallow footing is estimated by means of the upper bound method of limit analysis. In the case of applying the upper bound, the results depend on the failure mechanism. So the failure surface is correctly studied through the model test using sand. New method is proposed to estimate the bearing capacity of the eccentrically loaded shallow footing by means of the upper bound method to apply the failure mechanism based on the model test. The propriety of new method is verified by the results of various methods. And the influences of the variables eccentricity, embedment depth, variations of contact width factor by model test using sand are also studied in this paper

F.D.M.을 應用한 1次元 壓密解析의 最適法 糾明

김지호,류권일,고영헌,김팔규 忠南大學校 産業技術硏究所 2001 산업기술연구논문집 Vol.16 No.2

In general, the term soft ground includes clayey soils, which have large compressibility and small shear resistance due to the external load. All process of consolidation in compressible soils can be explained in terms of transfer of load from an incompressible pore-water to a compressible soil structure. Therefore, one of the most important subjects about the characteristics of the time-dependant consolidation of the clay foundation by the charge of load may be the presumption of the final settlement caused by consolidation and the degree of consolidation according to the time. Pioneering work by Terzaghi imparted scientific and mathematical bases to many aspects of this subject and many people have used this theory to measure the consolidation settlement until now. In the paper, Finite Difference Methods for consolidation are considered. First, it is shown the stability criterion of Explicit scheme and the Crank-Nicolson scheme, although unconditionally stable in the mathematical sense, produces physically unrealistic solutions when the time step is large, it is also shown that The fully Implicit scheme shows more satisfactory behavior, but is less accurate for small time steps. And then we need to decide what scheme is more proper to consolidation. The purpose of this paper is to suggest the pertinent scheme to consolidation.

地中送電관의 최적 되메움재 선정을 위한 열특성 硏究

윤성중,류권일,고영헌,김팔규 忠南大學校 産業技術硏究所 2003 산업기술연구논문집 Vol.18 No.2

The purpose of this paper is development of the most suitable backfill material which increases thermal stability and decreases thermal resistances for increasing capacity of the transmission of electricity. In order to proceed this study, the sand which recently was used as backfill material and the stone dust as single material for most suitable backfill material was chosen and experiments on thermal character and basic soil properties were proceeded for appreciating stability and economical efficiency. As a result of this study, natural moisture content of stone dust was higher than that of sand and porosity of stone dust and thermal resistance of stone dust was lower than that of sand. Then the stone dust are expected to increase capacity of the transmission of electricity. In point of stability, because total strain of pipe was within allowed strain, two materials are expected to ensure against risks. Stone dust is considered as useful backfill materials by contributing great economical efficiency, because a price of stone dust is half to the sand.

CRS 압밀시험속도 산정에 관한 연구

김팔규,류권일,최명진,고영헌 충남대학교 공업교육연구소 2002 論文集 Vol.25 No.1

Even though STD test based on Terzaghi's 1-D consolidation theory is extensively used to estimate the consolidation constant of soft-clay, it takes too much time to perform the test in addition to the problem in estimation of C_v and preconsolidation pressure. To overcome these defects, several types of rapid consolidation test, e.g., Constant Rate of Strain Test (CRS) and Controlled Gradient (CG), are proposed. Because consolidation characteristics obtained from the results of CRS test depend on the rate of rate of strain, it is repuired to determine the variation rate on the basis of the physical and structural characteristic in a building site, and then perform the test. Several methods determining the rate of strain, e.g., ASTM standard, Smith and Wahls' equation in 1969 and Armour and Drnevich's equation in 1986, have been researched. However, the rules about consolidation rates described in ASTM consider only the summary of the rate rules as a trial and error and its criterion also depends only on LL value. In this thesis, the test rate and parameters related in addition to LL value considered on ASTM basis are esamined in many fidlds of view ane the corresponding rate criterion is proposed.

일정변형률 압밀시험에 있어서 속도기준과 물성인자와의 상관관계에 관한 연구

김팔규,류권일,최명진,고영헌 忠南大學校 産業技術硏究所 2002 산업기술연구논문집 Vol.17 No.2

Even though STD test based on Terzaghi's 1-D consolidation theory is extensively used to estimate the consolidation constant of soft-clay, it takes too much to perform the test in addition to the problem in estimation of C_v and preconsolidation pressure. To overcome these defects, several types of rapid consolidation test, e.g., constant rate of strain test (CRS) an controlled gradient (CG), are proposed. Because consolidation characteristics obtained from the results of CRS test depend on the rate of strain, it is required to determine the variation rate on the basis of the physical and structural characteristic in a building site, and then perform the test. Several methods determining the rate of strain, e.g., ASTM standard, Smith and Wahls' equation in 1969 and Armour and Drnevich's equation in 1986, have been researched. However, the rules about consolidation rates described in ASTM consider only summary of the rate rules as a trial and error an its criterion also depends only on LL value.